Hi there!

The omitted type is intended, to avoid the duplication between the type in the argument list and the PHPdoc (this can only get out-of-sync). According to thespecification of phpDocumentor (and the related "draft" PSR), the type can be omitted in@param:

With the@param tag it is possible to document theType and the intent of a singleargument of a function or method.When provided it MAY contain aType to indicate what is expected.

This is actually anopen bug in phpstorm.

Although the codebase is not consistent on this point (that's another topic), I'm 👎 for the reason given by Wouter: this is a PHPStorm bug, not a Symfony one. Thanks for proposing, hope to see you in another contrib